Abstract
In this work, Pt-Pd catalysts (≈ 35 wt.%, Pt:Pd atomic ratio ≈ 1:2) supported on carbon black, carbon nanofibers and carbon xerogels have been synthesized in order to assess their activity toward the oxygen reduction reaction (ORR). X-ray diffraction (XRD) and transmission electron microscopy (TEM) analysis showed low particle and crystallite sizes with good dispersion on carbon supports. Regarding the ORR, the Pt-Pd nanoparticles supported on carbon black displayed the best performance in terms of high diffusional current densities, high specific and mass activities, number of electrons involved in the ORR and enhanced corrosion resistance. The improved performance of this catalyst has been explained from the modification of the Pt-Pt interatomic distance by Pd and the holding/re-reducing of the hydrogen peroxide formed during the ORR, promoting the water formation. In general, the synthesized materials displayed an upgraded corrosion resistance compared with that of the commercial Pt catalyst, suggesting them as suitable candidates to be employed as cathodes in PEMFCs since their Pt content is lower than that of the commercial Pt/C.
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